221210211006 has 16 divisors (see below), whose sum is σ = 491578246800. Its totient is φ = 73736736984.

The previous prime is 221210210989. The next prime is 221210211007. The reversal of 221210211006 is 600112012122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221210211006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210211007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2048242641 + ... + 2048242748.

It is an arithmetic number, because the mean of its divisors is an integer number (30723640425).

Almost surely, 2^221210211006 is an apocalyptic number.

221210211006 is an abundant number, since it is smaller than the sum of its proper divisors (270368035794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221210211006 is a wasteful number, since it uses less digits than its factorization.

221210211006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096485400 (or 4096485394 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 221210211006 its reverse (600112012122), we get a palindrome (821322223128).

The spelling of 221210211006 in words is "two hundred twenty-one billion, two hundred ten million, two hundred eleven thousand, six".